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《Journal of Forestry Engineering》 2019-01
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Optimization for molding of charocal based filter for drinking water purification

LIANG Guangyuan;ZHANG Yiding;SUN Yi;XU Haocheng;SHU Liqiang;XU Feiyang;ZHANG Wenbiao;School of Engineering,Zhejiang Agriculture and Forestry University;Shandong Institute for Product Quality Inspection;  
The issue on cleaning drinking water has been noticed increasingly in China. The filter made of coconut shell activated charcoal(CAC) performs good purifying performance,while the price of coconut shell in China has been dramatically climbed up because of its limited resource and dependence on import from other countries. The bamboo activated charcoal(BAC) has good adsorption ability,which makes it possible as an alternative for the filtering material. In order to achieve the best parameters for the molding of BAC-based filter for drinking water purification,BAC was used as a rawmaterial,high-density polyethylene(HDPE) was as an adhesive and CAC was for a comparison. The rawmaterial was extruded with the activated charcoal extruder,and the response surface methodology was used to optimize the extruding process,in which three factors,namely,adhesive addition,moisture content and particle size were dominant.Four response values were collected,namely,density,pressure resistance,permeability and iodine adsorption. With the Increase of moisture content(MC) and resin addition value(RAV),the density of filter decreased,and with particle size(PS) became larger,density decreased and then increased later. With the increases in MC and RAV,the pressure resistance became lower,while it was higher with larger PS. Little effects of MC and PS on iodine adsorption were found,while it became weaker with the increase in the RAV. The permeability became worse with the increases in the MC,RAV and PS. According to the results of SEMand EPR,the physical function for water purification of filter took the lead,and chemical one only made less effect. The removal rate of the BAC filter for liquid formaldehyde was good,indicating that it could effectively remove organic pollutant in drinking water. With an increase in filter addition value(FAV),the removal rate of CODMnincreased,and when the FAV reached 400 mg,the filter was saturated. The adsorption models of both the BAC filter and the CAC filter conform well with Freundlich Model.
【Fund】: 农业科技成果转化资金项目(2010GB2C200175);; 浙江农林大学学生科研训练项目(2013200054)
【CateGory Index】: TQ424.1;TU991.2
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